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2. Get More Omega-3 Fatty Acids

In recent years, researchers have noted that omega-3 polyunsaturated fatty acids (found in fatty fish, flaxseed, and walnuts) may help protect against depression. This makes sense physiologically, since omega-3s appear to affect neurotransmitter pathways in the brain. Past studies have suggested there may be abnormal metabolism of omega-3s in depression, although some more recent studies have suggested there may not be a strong association between omega-3s and depression. Still, there are other health benefits to eating fish a few times a week, so it's worth a try. Shoot for two to three servings of fish per week.

3. Eat a Balanced Breakfast

Eating breakfast regularly leads to improved mood, according to some researchers -- along with better memory, more energy throughout the day, and feelings of calmness. It stands to reason that skipping breakfast would do the opposite, leading to fatigue and anxiety. And what makes up a good breakfast? Lots of fiber and nutrients, some lean protein, good fats, and whole-grain carbohydrates.

4. Keep Exercising and Lose Weight (Slowly)

After looking at data from 4,641 women ages 40-65, researchers from the Center for Health Studies in Seattle found a strong link between depression and obesity, lower physical activity levels, and a higher calorie intake. Even without obesity as a factor, depression was associated with lower amounts of moderate or vigorous physical activity. In many of these women, I would suspect that depression feeds the obesity and vice versa.

Some researchers advise that, in overweight women, slow weight loss can improve mood. Fad dieting isn't the answer, because cutting too far back on calories and carbohydrates can lead to irritability. And if you're following a low-fat diet, be sure to include plenty of foods rich in omega-3s (like fish, ground flaxseed, higher omega-3 eggs, walnuts, and canola oil.)

5. Move to a Mediterranean Diet

The Mediterranean diet is a balanced, healthy eating pattern that includes plenty of fruits, nuts, vegetables, cereals, legumes, and fish -- all of which are important sources of nutrients linked to preventing depression.

A recent Spanish study, using data from 4,211 men and 5,459 women, showed that rates of depression tended to increase in men (especially smokers) as folate intake decreased. The same occurred for women (especially among those who smoked or were physically active) but with another B-vitamin: B12. This isn't the first study to discover an association between these two vitamins and depression.

Researchers wonder whether poor nutrient intake may lead to depression, or whether depression leads people to eat a poor diet. Folate is found in Mediterranean diet staples like legumes, nuts, many fruits, and particularly dark green vegetables. B-12 can be found in all lean and low-fat animal products, such as fish and low-fat dairy products.

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